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Updated: May 8, 2025
By far the greater number of the recent marine species occurring in the several Crag formations are still inhabitants of the British seas; but even these differ considerably in their relative abundance, some of the commonest of the Crag shells being now extremely scarce as, for example, Buccinum Dalei while others, rarely met with in a fossil state, are now very common, as Murex erinaceus and Cardium echinatum.
Turton's "British Bivalves." Besides, aculeatum is a far thinner and more delicate shell. And a third species, C. echinatum, with curves more graceful and continuous, is to be found now and then with the two former.
By far the greater number of the living marine species included in these tables are still inhabitants of the British seas; but even these differ considerably in their relative abundance, some of the commonest of the Crag shells being now extremely scarce; as, for example, Buccinopsis Dalei; and others, rarely met with in a fossil state, being now very common, as Murex erinaceus and Cardium echinatum.
And it is noteworthy, first, that the defensive thorns which are permanent on the two thinner species, aculeatum and echinatum, disappear altogether on the thicker one, tuberculatum, as old age gives him a solid and heavy globose shell; and next, that he too, while young and tender, and liable therefore to be bored through by whelks and such murderous univalves, does actually possess the same briar- prickles, which his thinner cousins keep throughout life.
We obtained, at the same time, large pieces of Labularia digitata, Sertularia abietina, upon which nothing of the animal kind was to be seen, but attached to which was frequently found Flustra dentata; also Pagurus Bernhardus, Fusus antiquus, Rostellaria pes pelecani, Cardium echinatum, Ascidia Prunum, Balanus sulcatus, Echinus saxatilis, and Spatangus flavescens.
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